Treetops are all the rage these days. Ecotourism destinations include a tree house restaurant in Auckland and a t(r)eahouse in Japan. And for the stir-crazy office worker there are even tree house offices popping up in the Pacific Northwest. Add to this list the University of Pennsylvania s Morris Arboretum in Philadelphia. Out on a Limb, a new permanent installation at the arboretum, invites you to literally experience trees as the birds andrnsquirrels do.
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